# WHATPORT(2046)

## NAME

port 2046 — sdfunc (registration only) — The sibling of 2045's cdfunc — same blank registration, same absence of software.

Protocol: TCP/UDP  
IANA registry

## DESCRIPTION

IANA registers sdfunc on TCP and UDP 2046 with no description, assignee or reference, and it appears in Unix /etc/services as a bare name for the same reason. Nothing widely deployed listens here, and Nmap's frequency table puts it near the bottom at roughly 0.02% of hosts. There is no protocol to describe because none was ever documented.

## EXPOSURE

**Expose with care.** A listener on an undocumented port is an unknown service. Identify the process before exposing it.

## CHECK

```sh
sudo lsof -nP -iTCP:2046 -sTCP:LISTEN
```

## SEE ALSO

- iana — [IANA Service Name and Transport Protocol Port Number Registry](https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml) (iana.org)
- source — [nmap-services — Nmap port frequency data](https://github.com/nmap/nmap/blob/master/nmap-services) (github.com)

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HTML: <https://whatport.net/2046/> · JSON: <https://whatport.net/2046.json> · full dataset: <https://whatport.net/ports.json>